Well, Harley Quinn's Revenge was a load of shit. Great playing as "The Boy Wonder", and the relationship between Batman and Robin seems more "Frank Miller" than golden age Batman (in that Batman patronises Robin, rather than shares a bed with him and giving him ice cream), but it was stupidly short. It doesn't take away the goodness of the core gameplay, but this DLC was one of the main reasons I waited for this GOTY edition. It's still tremendous value, but my expectations were much higher.